It is the body’s way of keeping itself safe from being infected by various bacteria, viruses and other infectious organisms like worms. Various cells, tissues and organs make up the immune system. The most well known and common part of the immune system are white blood cells or WBC. They are the fighter cells within the body and their main function is to attack a possibly harmful foriegn body. It does so by a process called as the ‘immune response’. Apart from WBCs there are other cells called leucocytes that help the WBC perform their function. There are a number of ways to improve ones immunity, and one of the most important methods is to have a good diet and maintain a healthy lifestyle.